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(No Model.)

E E. CARTER. FIRE BOX FOR STEAM BOILERS.

No. 284,610. Patented Sept. 11, 1883.

OOOYO'OOOOO Z i/lTms 5 NITED STATES I PATENT OFFICE.

EDWVIN E. CARTER, OF IVAYNESBURG, PENNSYLVANIA, ASSIGNOR TO SARAH E. CARTER, OF SAME PLACE.

FIRE -BO X FOR ST EAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 284,610, dated September 11, 1883.

Application filed June 29, 18: 3. (No model.)

To all whom it may concern:

Be it known that I, EDWIN E. CARTER, a citizen of the United States, residing at \Vaynesburg, in the county of Greene and State of Pennsylvania, have invented certain new and useful Improvements in Fire-Boxes for Steam-Boilers, of which the following is a specification, reference being had therein to the accompanying drawings, in which- Figure 1 isa perspective of a portable steam boiler and engine embodying my invention. Fig. 2 is a perspective of the fire-box. is a central vertical section, and Fig. 4 a front elevation.

Like letters refer to like parts in all the figures.

The principal object of my invention is the production of a simple, safe, and serviceable steam-boiler without undue expense or cost of manufacture.

In the present invention certain features of construction are adopted which overcome many objections attending the construction and-use of boilers as heretofore built. In

most cases the fines have been connected to the opposite heads, so that their contraction and expansion, especially in the direction of their length, has a great tendency to produce leaking at the joints in the heads, and in all cases where flues are so arranged as to permit this longitudinal variation in length its effect is made apparent after. a shorter or longer period of use. To avoid this objection I employ a curved flue and secure a single end 3 5 thereof to the shell and at a side wall thereof,

and construct the opposite end and connect the same with the boiler in such a manner that the contraction and expansion of the flue is either unobstructed in the flue itself or diffused by and throughout free unattached portions of the shell. Furthermore, with this principle of construction in view, I have devised and put to practical and satisfactory test a combined flue and fire-box, and in order to 4 5 avoid undue expense in its manufacture I have formed them in one piece or casting. Other advantages will appear in the following de scription, and the novel features of construction will be specifically set forth in the claims. In Fig. 1 I have illustrated an inclined Fig. 3

boiler, and in the remaining figures upright or vertical boilers, the embodiment of my improvements being feasible in either position, and the variation in the conformation of the fire-box and flue being apparent and Within the province of mechanical skill, no particular description of those variations is necessary. .Nor do I limit my invention to an application to either an inclined or vertical boiler, but deem its use in either an infringement of my rights.

A represents the boiler-shell, upon which, in this instance, are mounted the cylinder crankshaft and bearings for theusual moving parts of the engine B, and the shell is also provided witha suitable water-supplying pipe, L, and test;cocks O, the exhaust discharging into the smoke-stack D. These parts may be of any de sired construction and arrangement.

E represents the single casting, comprising the combined flue and fire-box. It is apparent that these elements may be formed of more than one piece and stillpossess the advantages of the arrangement and manner of connecting them with the boiler, and I therefore, in this 7 5 sense, do not limit myself to the same when formed in one piece, but prefer such construc tion 011 account of its cheapness. The single casting comprises a bottom plate ,or partial head, 6, a back plate or wall, 6, to the fire-box 8o proper, F, a curved flue, G, an intermediate Waterspace, H, an inwardly-proj ecting flange,

g, at the outer end of the flue, and a dependingflange, 6", all around the lower edge of the casting, which edge is recessed to form a stokehole or door, I, to the fire-box. The general outline of all the flanged portions of the casting is such as will conform to a cylindrical shell or boiler, so that the connection of the one to the other maybe made steam tight by bolts 0 or rivets, as usual, the flange g of the flue being disposed inwardly and the flange c outwardly to facilitate the operation of riveting. As shown in Fig. 1, a separate casting, forming the ash-pit, is secured to the casting E and 5 boiler, and between the casting and ash-pit a grate, J, is supported.

As shown in Fig. 4, the walls of the firebox portion of the casting may be extended to and form the means of supporting a grate, J,

which construction is preferable for vertical boilers. In the inclined boiler the door K is hinged at 75 k, and is provided with a sto k, which holds the door when opened, so as to serve as a chute for the fuel.

It is apparent that as constructed and con nected to the boiler the flue G is free to 6X- pand in all directions, that the products of combustion pass from the fire-boxinto the flue, and in turning the bend or curve thereof are checked and give off their greatest heat, so that contraction and expansion are greatest at this point which is unattached to the shell, while the contraction and expansion of the casting, as a whole, is exerted at the base of the shell and at its side where the flue G is attached, and-any variation in the line connecting these two points will be conformed to by a simple spring or warp in the contour transversely of the shell, whereby such variation or strain is diifused by and within the shell, thus relieving in a great measure strain at the joints.

Having described my invention and its operation, what I claim is- 1. A. combined fire-box and flue comprising the base-plate or head 0,-wall c, and curved flue G, substantially as shown and described.

2. The combined fire-box and curved flue formed of a single casting, and provided with the attaching flanges g e", substantially as specified.

3. The combination of a boiler or shell, A, acurved flue, G, secured to -one side of said boiler or shell, and merged into a fire-box secured to the end of said shell, substantially as specified,

4. The combination of the boiler or shellA and the singlecasting E, secured at its base to the bottom of the shell and at its upper end to the side of the shell, substantially as specified.

5. The combination of the boiler orshell A with the integral curved flue and fire-box, having, respectively, the inward flange g and the depending flange c and with the grate J, substantially as shown and described.

In testimony whereof I aflix my signature in presence of two witnesses.

EDWVIN E. CARTER. \Vitnesses:

THOMAS MENDENH'ALL, THOMAS STRIMG-ER. 

